Date: Fri, 23 Jan 2004 18:27:40 +1100 From: Peter Jeremy <peterjeremy@optushome.com.au> To: freebsd-current@freebsd.org Subject: Re: MFS question - FreeBSD 5.2-CURRENT Message-ID: <20040123072740.GA53327@server.vk2pj.dyndns.org> In-Reply-To: <BAY1-F139yKzggqJMpY00009050@hotmail.com> References: <BAY1-F139yKzggqJMpY00009050@hotmail.com>
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On Thu, Jan 22, 2004 at 09:16:14PM +0000, Rob MacGregor wrote: >>Note that softupdates will not perform any physical writes for short- >>lived (say less than 30 seconds) files. > >That's worth knowing - do you know how big the buffer is likely to be? I'm >thinking worst case of a 10 MB zip in an email, maybe expanding to 20 MB. As someone else mentioned, there is no fixed size. The kernel will allocate RAM to the buffer as well as running processes. For some background on softupdates, have a look at: Gregory R. Ganger's original paper on SoftUpdates: http://www.ece.cmu.edu/~ganger/papers/CSE-TR-254-95/ Kirk McKusick's papers on SoftUpdates (which discusses the FreeBSD implementation: http://www.mckusick.com/softdep/index.html Peter
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